926KB - 高知工科大学

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SN34LS624
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(HD74HC86FP-E) .................................................................................. 14
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１．１ 研究背景
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１．２ 研究内容
１．３ 論文構成
NJM2267
VCO SN34LS624
EXOR(HD74HC86)
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２．１ 変調方式
s (t ) = cos pt
FM
f FM (t ) = Ac cos(ωct +θc + mf / p sin pt
= Ac cos(ωct +θc + mF sin pt )
mF = m f / p
ωc − m f
FM
ωc + m f
Δω = m f
Δω
Δω
p
F
Δω/ p
θc = 0
f FM (t ) = Ac cos(ωct + mF sin pt )
= Ac {cosωct cos(mF sin pt ) − sinωct sin( mF sin pt )}
∞
∑J
cos(mF sin pt ) =
n
(mF ) cos npt
n = −∞
∞
∑J
sin( mF sin pt ) =
n
(mF ) sin npt
n = −∞
FM
∞
f FM (t ) = Ac
∑J
n
(mF ) cos((ωc + np )t )
n = −∞
FM
mF
mF
mF
FM
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FM
J n ( mF )
mF
J n (mF ) ≅ (mF / 2) n 1 / n!
mF
θc =
ωc =
s(t)=
mF ≤ 1 / 2
n≥2
f FM = FM
mF =
( p ≡ 15)
２．２ パルス変調とは
Pulse Width Modulation
on off
Pulse Frequency Modulation
SN
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２．３ パルス化ＦＭ
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３．１
全体の構成図
(a)
VCR
VCR
75Ω
VCO
VCO
VCO
LPF(
)
LPF
100μH
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３．２
受信機／送信機回路図
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３．３
集光
10
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４．１ 増幅器（ＮＪＭ２２６７）
Ω
DC
CLAMP
Ω
12
dB
V
Vi
20 log 10 (V0 / Vi ) = 6
log 10 (Vo / 7 ) = 0.3
V o / 7 = 10 0.3
V o = 14
Vo
14V
電圧制御発信機（ＳＮ３４ＬＳ６２４）
４．２
Voltage Controlled Ocillator
SN34LS624
Vcc
OSC Vcc
Cext
TA
RNG
13
Vo
Output Frequency (MHz)
OUTPUT FREQUENCY
25
20
V1(rng)=0V
V1(rng)=1V
V1(rng)=2V
15
10
5
0
0
2
4
Input Voltage (V)
RNG
４．３
6
F
乗算器（ＨＤ７４ＨＣ８６ＦＰ－Ｅ）
Exclusive-OR
① ② ③
14
①
②
①
③
②
①
②
①
③
②
③
15
②
４．４
レーザーポインタ
3.5×2.5mm
16
17
100KHz
②
2.8V
①
100KHz
1.4dB
③
VCO
VCO
③
MHz
VCO
42MHz
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①
100KHz 2.5
100KHz
②
①
②
μs
③
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20
21
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謝辞
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参考文献
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